Fanxin - Nautilus
Nautilus is a colourful puzzle in the shape of a Nautilus shell. It is mechanically similar to the Sq-1, as it has three layers, where the middle layer is split through the middle into two halves. When solved, the top and bottom layers each consist of seven pieces arranged like slices around the centre point.
The seven pieces in a layer have different angular sizes, namely 20, 30, 40, 50, 60, 70, and 90 degrees, and are coloured like a rainbow from violet to red. The outer layers can rotate about their centre point. If both layers are rotated such that the seam through the middle layer lines up with seams between the pieces, then you can turn over half the puzzle, mixing the pieces from the two outer layers together.